package com.itheima.reggie.filter;

/*
* 检查用户是否已经登录
* */


import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns ="/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();


    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//强转
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

//        1、获取本次请求的URI
        String requestURI = request.getRequestURI();
//        2、判断本次请求是否需要处理--检查登录状态

        log.info("拦截到请求：{}",requestURI);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login",
                "/doc.html",
                "/webjars/**",
                "/swagger-resources",
                "/v2/api-docs"
        };
        boolean check=check(urls,requestURI);
//        3、如果不需要处理，则直接放行
        if(check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        Long empId = (Long) request.getSession().getAttribute("employee");
//        4、判断登录状态，如果已登录，则直接放行
         if(empId!=null){
             log.info("用户已登录，用户信息为{}", empId);

             BaseContext.setCurrentId(empId);


             filterChain.doFilter(request,response);

             BaseContext.removeCurrentId(empId);
             return;
         }

        if(request.getSession().getAttribute("user")!=null){
            Long userId = (Long)request.getSession().getAttribute("user") ;
            log.info("用户已登录，用户id为{}", userId);
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }



//        5、如果未登录则返回未登录结果
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 判断本次请求是否需要处理
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            boolean match=PATH_MATCHER.match(url,requestURI);
            if(match)
                return true;
        }
        return false;
    }
}
